Your car weight is 3350 then a 42 shooter is to big u should be around 35 or 37 in the front and the back other wise u r wasting fuel is all....set your shooters tell you get best time then change your carb cam to another setting until it starts to fall away then reset your shooters.........my car with me in it is 2645 and i use a 37 shooter any bigger does nothing for me....weight of your car has alot to do with it as it takes longer to get a bigger car moving hence the smaller shooter will give you the same amount of fuel as a bigger one but over a longer period of time.....same with your carb cams they react with your throttle so the curve of them controls your shooter fuel............that is why they have holes in them to make them more agressive or to slow it down same reason the diffrent cams have longer or smaller rams to control the fuel curve to the shooters